352 M33 Upgrade To 660 — Psp

Accept Sony's licensing agreement and let the installation complete.

: If your PSP displays "9.90," it is because older M33 firmware used a "version spoof" to prevent accidental Sony updates. You may need to access the Recovery Menu (hold the Right Trigger while booting) and disable version spoofing or manually edit the version.txt file via USB.

Connect your PSP to the PC one final time. You will notice a folder named ISO directly at the root level of your memory stick (outside the PSP folder). This is where you can back up your digital ISO and CSO game files. psp 352 m33 upgrade to 660

With your PSP resting on official firmware 6.60, you can choose your final modern CFW destination. is highly recommended for standard users due to its excellent plugin compatibility and built-in online play features. Step-by-Step Installation Download the 6.60 PRO-C2 (or PRO-C Fix3) release pack.

Follow the on-screen instructions. Your PSP will reboot, now running Official 6.60 Firmware. Step 2: Install 6.60 PRO-C2 Custom Firmware Once you are on 6.60, you can reinstall custom firmware. Download the package. Accept Sony's licensing agreement and let the installation

Press to flash the custom firmware. The process takes less than five seconds.

If it just says , download the 3.52 M33-4 update pack . Connect your PSP to your PC via USB. Connect your PSP to the PC one final time

Phase 5: Installing Modern 6.60 Custom Firmware (PRO-C or ME)

Older custom firmwares sometimes conflict with modern updates. We need to clean up the system before installing the official firmware.

| Problem | Likely Cause | Solution | |--------|--------------|----------| | when launching PRO Update | Corrupted download or wrong folder structure | Delete and recopy PRO-C2 files. Ensure no plugins are active. | | PSP turns off immediately after launching update | Battery level too low or fake Memory Stick | Plug in AC adapter. Use a genuine Sony or high-quality Memory Stick. | | WiFi no longer works after upgrade | IDStorage key corruption from old M33 | Run KeyCleaner v1.4. If that fails, use PSARDumper to reflash keys from OFW. | | “The system configuration is corrupted” | Flash1 settings conflict | Hold R on boot → Advanced → Format flash1 and reset settings. | | Game saves show as corrupted | Save was encrypted with old 3.52 kernel | Use MagicSave’s “unlock” and “re-crypt” functions. | | PSP boots to OFW after full shutdown (non-permanent) | You have a PSP-3000 or didn’t install CIPL | Launch “FastRecovery” from Game menu. Or install Infinity 2.0. |